Kid Rock announced that he plans to run for U.S. Senate in Michigan Wednesday. (Charles Sykes/Invision/AP)

U.S. Sen. Elizabeth Warren is urging supporters to take singer Kid Rock's announcement that he plans to run for Senate seriously, by likening his potential candidacy to Trump's successful 2016 presidential run.

"I know a lot of people are thinking: this is some sort of joke, right?" Warren wrote in a fundraising email with the subject line "Senator Kid Rock (R-MI)."

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"Well, maybe this is all a joke — but we all thought Donald Trump was joking when he rode down the escalator at Trump Tower and announced his campaign, too," she continued, according to The Boston Herald.

The musician, whose real name is Robert James Ritchie, announced he would run for U.S. Senate in Michigan in a tweet Wednesday.

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U.S. Sen. Elizabeth Warren sent a letter to supporters urging her Democratic base to take Kid Rock's run seriously. (Jose Luis Magana/AP)

"I had a ton of emails and texts asking me if this website is real ... kidrockforsenate.com The answer is an absolute YES," he wrote.

Warren acknowledged that the campaign announcement could be a publicity play for his musical career.

"And sure, maybe this is just a marketing gimmick for a new album or tour — but we all thought Donald Trump was just promoting his reality TV show, too," she said in her email.

Warren included a link for supporters to contribute to U.S. Sen. Debbie Stabenow, as well as to her own 2018 re-election campaign.

"She uses any and every issue, whether it's a celebrity Republican or it's Hillary Clinton, to try to scare her support base into giving her more money so that she can reach that main goal I believe of running for president … not of focusing on the concerns of her constituents in Massachusetts," Diehl said.

Ritchie wrote a post on his website Thursday saying that he would continue releasing music during his campaign, which he insisted is "not a hoax."

He wrote that he will be "a voice for tax paying, hardworking AMERICANS."

Kid Rock is selling a line of Donald Trump-themed t-shirts on his website. (kidrock.warnerbrosrecords.com)

He has launched a separate side — kidrockforsenate.com — that only sells merchandise including caps, t-shirts, stickers, and yard signs.

The site links to an official Kid Rock store that sells more political apparel, including a t-shirt that reads "God Guns & Trump."